JavaScript Function not working if src is a variable?

The reason it's not working is that you can't add a src to a script element that's already in the DOM — or rather, doing so doesn't do anything. The script element has already been processed.

Instead, create it and then append it:

var script = document.createElement("script");
script.onload = function() {
    myFunc();
};
script.src = SettingsFile.UrlToMyJS;
document.head.appendChild(script);
// If you need to support IE8, use the following instead of the previous line:
//document.getElementsByTagName("head")[0].appendChild(script);

That waits for the script to load, then calls myFunc (which should exist by then).

Also note that as I and Jeremy pointed out in the comments, body doesn't go in head, it goes after. It's also generally best to put script tags at the end of body (if you're not using async or defer attributes on them or type="module"). So in all, something like:

<head>
    <!-- head stuff here -->
</head>
<body>
    <!-- content here -->
    <script src="https://myurl.de/settingsFile.js"></script>
    <script type="text/javascript">
    var script = document.createElement("script");
    script.onload = function() {
        myFunc();
    };
    script.src = SettingsFile.UrlToMyJS;
    document.head.appendChild(script);
    // If you need to support IE8, use the following instead of the previous line:
    //document.getElementsByTagName("head")[0].appendChild(script);
    </script>
</body>

Another option is to use document.write. This sort of thing may be the last at-least-partially appropriate use of document.write during the main parsing of the page:

<head>
    <!-- head stuff here -->
</head>
<body>
    <!-- content here -->
    <script src="https://myurl.de/settingsFile.js"></script>
    <script type="text/javascript">
    document.write('<script src="' + SettingsFile.UrlToMyJS + '"><\/script>');
    </script>
    <script>
    myFunc();
    </script>
</body>
Answer:1

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